Calculate Depreciation only at the year end and excluding it on sale of assets during the year

Dear Friends,

I have a problem wherein i have to define a probable solution for depreciation.

Conditions are : -

• Depreciation to be calculated annually only
• Depn on the assets present at the year end only.
• Depn calculation on sale of assets to be excluded while posting such sale.
• Any assets posted before year end whether on the 1st day or last day of the year will have full year depreciation.

Do not compare it with a company type depreciation, since it is for a trust organisation wherein no specific rules exists for book depreciation.

Kindly reply as early as possible

I have tried Tcode OAYR - for shifting depreciation calculation to annual (which is helpful) for AFAB ( depn run only)

But for the assets sold during the year it does not comply.

I have tried Period control and defined a new key with the modified period control but it does not help.

Your help would be appreciated.